In addition, the result of the four-way coupled method is influenced to a large extent by the values of the collision model parameters. It appeared that there is a considerable dependency of the erosion profile on the material hardness. For the same type of problem, the numerical erosion profile is compared to experimental values. From that study, it is found that the fluid and particle velocity fields can be calculated with reasonable accuracy. Using the aforementioned combination of models several studies are conducted, starting with a validation study using a submerged impinging jet benchmark. The collisions of the particles with the wall are modeled using the Grant-Tabakoff model, whereas the linear soft sphere model is used for the inter-particle collisions. For the turbulence of the water, the k-ω SST turbulence model is used. The numerical computations are performed using the commercial software ANSYS Fluent. Within the CFD framework, it is found that the appropriate model for calculating the flow of the slurry (water with sand particles) is the Eulerian-Lagrangian method. The focus of the project is on developing, validating and demonstrating a numerical model capable of estimating the erosion wear due to slurry flow on the impeller blades of a centrifugal dredge pump by using Computational Fluid Dynamics (CFD).
This Master's Thesis project is carried out by the author during a 12-month period at Damen Dredging Equipment in Nijkerk, The Netherlands. In that way, the efficiency of dredge processes can be increased considerably. In addition, instructions for the maintenance of the pump can be composed based on the expected erosion wear. This information can be used to increase the erosion resistance of pump components. The use of numerical models to estimate the erosion wear in centrifugal dredge pumps can give insight into the principal erosion zones and the magnitude of the erosion in those zones. Therefore, components or complete pumps have to be replaced after some time. The constant impingement of sand particles on the wetted surfaces of a centrifugal dredge pump causes the performance of the pump to deteriorate. Kleermaker, Wim (TU Delft Aerospace Engineering) Erosion Estimation for the Impeller Blades of Centrifugal Dredge Pumps
0 kommentar(er)
